Dobby of the hattersley type.



H. STAUBLI. DOBBY OF THE HATTERSLEY TYPE. APPLICATION FILED MAB. 6, 1911. 1,017,1 4, Patented Feb. 13,1912.

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COLUMBIA FLANOGRAFH CO.,WI\SIHNOTON. D. c.

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H. STKUBLI. DOBBY OF THE HATTERSLEY TYPE.

APPLICATION FILED MARlG, 1911.

1,017,184, 7 Patented Feb. 13, 1912.

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UNITED STATES PATENT OFFICE.

HERMANN STAUBLI, OF HORGEN, SWITZERLAND, ASSIGNOR TO GEBR. STAUBLI, OF HORGEN, SWITZERLAND.

DOBBY OF THE. HATTERSLEY TYPE.

To all whom it may concern Be it known that I, I-IERMANN STAUBLI, a citizen of the Republic of Switzerland, residing at Horgen, Switzerland, have in vented new and useful Improvements in Dobbies of the Hattersley Type; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to dobbies of the Hattersley type. In dobbies of this type as hitherto constructed the lifter hooks, which as well known are so mounted as to be free to oscillate in balance lever bearings, engage with knives that are guided in slots. Now owing to the fact that the knives move in a straight line, while the movement of the lifter hooks is in a circular are as they rock in the balance lever bearings considerable friction results from relative movements at the connection of the knives with the hooks and in the balance lever bearings. Dobbies are also known wherein the knives are arranged on rocking levers so that consequently both the knives and the lifter hooks rock in the balance lever bearings. In these machines however the knives are rigidly fixed to the ends of the levers and on moving out of their normal positions they first move away from a horizontal line passing through the fulcrum point of the levers up to a point where their distance from same is a maximum, such point lying vertically over the fulcrum point of the levers, pass beyond this point and in so doing again approach the said horizontal line again up to the point where the rocking movement of the lever into the other extreme position thereof is completed. During this movement the knives, while traveling up to their point of maximum distance from the horizontal line, rock in the opposite direction to the simultaneous rocking movement of the lifter hooks in the balance lever bearings, thereby giving rise to jerks or shocks and great friction at the connections with the knives and at the balance lever bearings. In order as far as possible to minimize such friction and prevent the jerks or shocks referred to, in a dobby of the Hattersley type the knives Specification of Letters Patent. v

Application filed March 6, 1911.

Patented Feb. 13, 1912.

Serial No. 612,646.

in apparatus according to this invention are not guided in slots but are journaled at their ends in the ends of levers, the arrangement being such that a knife when in its normal position is located approximately above or below the fulcrum points of the levers. The result of such an arrangement is that the knives when in their normal position, are at the maximum distance from a horizontal line passing through the fulcrum points of the levers and the knives consequently only describe arcs that are in the same direction as, and similar to, those described by the lifter hooks in the balance lever bearings.

The drawings accompanying this specification illustrate by way of example one construction of apparatus embodying the invention.

Figure l is a sideelevation of a part of the machine. Fig. 2 is an enlarged detail view and Fig. 3 a plan of the parts shown in Fig. 2. Fig. 4 is a side elevation of the complete apparatus.

16 designates the main shaft to which motion is imparted from any suitable source of energy. The rotation of the shaft oscillates a lever 13 on a shaft 12 through the.

caused to rock in the direction of the arrows.

5 and 5 designate the knives corresponding to the hooks 1 and 2 respectively; these knives are furnished with pivots 6 at their ends, the arrangement being such that the working edges 7 of the knives are located in the axes of the pivots 6. The pivots 6 are journaledin forked bearings 8 fixed on the ends of arms 9 and 10 of two bell-crank levers 11 that are mounted on the rotary shaft 12. Rigidly attached to the shaft 12 is the lever 13 by operation of which the shaft 12 with the levers 11 are rocked.

14; designates guide-rods which are secured to the pivots 6 and freely sliding in bearings 15. By these means the knives 5 and 5 are turned around the axes of the pivots 6 when moved by the arms 9 and 10.

the blade 20 is suspended by cords 21.

The bell-crank levers 11 are so arranged that when the knife 5 is in its normal position, shown in full lines in Fig. 1, it lies vertically or approximately vertically above the shaft 12 and is at its maximum distance from a horizontal line A-B drawn through the shaft 12. Upon the knife being rocked in the direction of the arrow into its extreme outward position C it moves nearer to the horizontal line AB. On the other hand the knife 5 is at the same time rocked in the direction of the arrow out of its extreme outward position, shown in full lines in Fig. l, in which it most closely approaches the horizontal line A-B, into its normal position I) where it is at its maximum distance from the horizontal line A--B and vertically or approximately vertically below the shaft 12. The knives 5 and 5 thus describe arcs that are similar to and always lie in the same direction as the arcs described by the balance lever bearings 3 and 4-, by which means, in conjunction with the knives being free to rotate in the ends of the levers 9 and 10, the friction between the knives and lifter-hooks 1 and 2 and balance lever bearings 3 and l is reduced and jerks or shocks in the movement of these parts are prevented.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed I declare that what I claim is:

1. In a dobby of the Hattersley type, a bell crank lever, knives mounted to rotate in the ends of said lever, means connected to said knives to maintain them when moving in approximately the direction in which they are held when in their normal position, oscillating hooks to engage said rotatable knives, the knives being so disposed that in their normal position their working edges are alternately approximately in a vertical plane that includes the fulcrum point of the bell-crank lever.

2. In a dobby of the I-Iattersley type, a bell-crank lever, knives mounted to rotate in the ends of said lever, guide rods connected to said knives, bearings loosely sup porting said guide rods, oscillating hooks to engage said rotatable knives, the knives being so disposed that in their normal position their Working edges are alternately approximately in a vertical plane that includes the fulcrum point of the bell-crank lever.

3. In a dobby of the Hattersley type, a bell-crank lever, knives mounted to rotate in the ends of said lever, guide rods connected to said knives, bearings loosely supporting said guide rods, and oscillating hooks to engage said rotatable knives, the edges of the knives being located in the pivotal axis of the knives.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

I-IERMANN STAUBLI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

